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Today’s memory-foam mattresses don't sleep as "hot" as older models did, thanks to air-circulating layers and ventilated toppers that keep the foam from absorbing and retaining all your body heat. But a certain insulating effect is unavoidable when you're sleeping on a foam block. If your memory foam mattress leaves you sweating at night, a few remedies can help turn down the heat -- if only by a few degrees.

Top It Off

Anything you can do to distance your body from the memory foam will help keep you cool. Place a non-foam topper or pad over the mattress, or use sheets made of breathable material -- such as cotton or bamboo -- with a high thread count. Both remedies reduce the amount of body heat that penetrates to the foam.

Turn It Down

Lower the ambient temperature by turning the thermostat down, opening a window, or changing into lighter-weight, breathable pajamas. While these might not be the most convenient solutions, they're less expensive than purchasing a whole new mattress.

Switch to a Topper

If you just can't stay cool on a memory foam mattress, consider switching to a non-foam mattress. You can always layer a memory foam topper over the mattress for comfort, while still enjoying the other mattress's greater breathability to help keep the foam cool.